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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Computational Structural Engineering Institute of Korea
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Journal DOI :
The Computational Structural Engineering Institute
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Volume & Issues
Volume 28, Issue 6 - Dec 2015
Volume 28, Issue 5 - Oct 2015
Volume 28, Issue 4 - Aug 2015
Volume 28, Issue 3 - Jun 2015
Volume 28, Issue 2 - Apr 2015
Volume 28, Issue 1 - Feb 2015
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Topology Design Optimization of Plate Buckling Problems Considering Buckling Performance
Lee, Seung-Wook ; Ahn, Seung-Ho ; Cho, Seonho ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 441~449
DOI : 10.7734/COSEIK.2015.28.5.441
In this paper we perform a linearized buckling analysis using the Kirchhoff plate theory and the von Karman nonlinear strain-displacement relation. Design sensitivity analysis(DSA) expressions for plane elasticity and buckling problems are derived with respect to Young's modulus and thickness. Using the design sensitivity, we can formulate the topology optimization method for minimizing the compliance and maximizing eigenvalues. We develop a topology optimization method applicable to plate buckling problems using the prestress for buckling analysis. Since the prestress is needed to assemble the stress matrix for buckling problem using the von Karman nonlinear strain, we introduced out-of-plane motion. The design variables are parameterized into normalized bulk material densities. The objective functions are the minimum compliance and the maximum eigenvalues and the constraint is the allowable volume. Through several numerical examples, the developed DSA method is verified to yield very accurate sensitivity results compared with the finite difference ones and the topology optimization yields physically meaningful results.
Analytical Closed Form Solution for the Impact Load of a Collision between Rigid Bodies and its Application to a Spent Nuclear Fuel Disposal Canister Accidentally Dropped and Impacted on the Ground: Application(Numerical Analysis)
Kwon, Young-Joo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 451~457
DOI : 10.7734/COSEIK.2015.28.5.451
This paper presents the analytical closed form solution for the impact load of a collision between rigid bodies and its application to a spent nuclear fuel disposal canister accidentally dropped and impacted on the ground. This paper performed a study on the numerical rigid body dynamic analysis to compute the impact load between two rigid bodies, especially, the impulsive force which is applied to the spent nuclear fuel disposal canister in the accidental drop and impact event on the ground. Through this study the impulsive force which is occurring in the spent nuclear fuel disposal canister under accidental drop and impact event on the ground and required in the process of structural safety design of the canister is computed numerically. The main content of this numerical study is about the technical method how to compute the impulsive force applied to the canister under the accidental drop and impact event on the ground by using the commercial computer code for the rigid body dynamic analysis. On the basis of this study a problem to compute the impulsive force which is occurring in the canister in the case of collision with the ground is numerically treated. This numerically computed impulsive force is compared with the theoretical value, which shows a good agreement.
Comparison between Numerical Results of 1D Beam and 2D Plane Stress Finite Element Analyses Considering Aspect Ratio of Cantilever Beams
Kang, Yoo-Jin ; Sim, Ji-Soo ; Cho, Hae-Sung ; Shin, Sang-Joon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 459~465
DOI : 10.7734/COSEIK.2015.28.5.459
There exist different kinds of aircrafts, such as conventional airplane, rotorcraft, fighter, and unmanned aerial vehicle. Their shape and feature are dependent upon their own assigned mission. One of the fundamental analyses performed during the aircraft design is the structural analysis. It becomes more complicated and requires severe computations because of the recent complex trends in aircraft structure. In order for efficiency in the structural analysis, a simplified approach, such as equivalent beam or plate model, is preferred. However, it is not clear which analysis will be appropriate to analyze the realistic configuration, such as an aircraft wing, i.e., between an equivalent beam and plate analysis. It is necessary to assess the limitation for both the one-dimensional beam analysis and the two-dimensional plate theory. Thus, in this paper, the static structural analysis results obtained by EDISON solvers were compared with the three-dimensional results obtained from MSC NASTRAN. Before that, EDISON program was verified by comparing the results with those from MSC NASTRAN program and other analytic solutions.
Linear Analysis and Non-linear Analysis with Co-Rotational Formulation for a Cantilevered Beam under Static/Dynamic Tip Loads
Ko, Jeong-Woo ; Bin, Young-Bin ; Eun, Won-Jong ; Shin, Sang-Joon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 467~475
DOI : 10.7734/COSEIK.2015.28.5.467
In this paper, the behaviour of a cantilevered beam was predicted to examine the difference between linear and non-linear static, dynamic analysis for a structure by using CR nonlinear formulation. Then, external transverse static and dynamic loads were applied at the free tip of the beam. Classical theories were used for the present linear analysis and co-rotational dynamic FEM program was used for the present nonlinear analysis. In the static analysis, effects of the load for the beam deflection were observed in both linear and nonlinear analysis. Then, normalized displacement at the tip of the beam was predicted for different frequency ratio and a significant difference was obtained in the vicinity of the resonant frequency. In addition, effects of frequency and time for the beam deflection were investigated to find the frequency delay.
Study on Cantilever Beam Tip Response with Various Harmonic Frequencies by Using EDISON Co-rotational Plane Beam-Dynamic Tip Load
Park, Chul-Woo ; Joo, Hyun-Shig ; Ryu, Han-Yeol ; Shin, Sang-Joon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 477~483
DOI : 10.7734/COSEIK.2015.28.5.477
In this paper, Euler-Bernoulli beam theories(EB-beam) are used, and Fast Fourier Transformation(FFT) analysis is then employed to extract their natural frequencies using both analytical approach and Co-rotational plane beam(CR-beam) EDISON program. EB-beam is used to analyze a spring-mass system with a single degree of freedom. Sinusoidal force with various frequencies and constant magnitude are applied to tip of each beam. After the oscillatory tip response is observed in EB-beam, it decreases and finally converges to the so-called 'steady-state.' The decreasing rate of the tip deflection with respect to time is reduced when the forcing frequency is increased. Although the tip deflection is found to be independent of the excitation frequency, it turns out that time to reach the steady state response is dependent on the forcing frequency.
Development of Nonlinear Triangular Planar Element Based on Co-rotational Framework
Cho, Hae-Seong ; Shin, Sang-Joon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 485~490
DOI : 10.7734/COSEIK.2015.28.5.485
This paper presents development of a geometrically nonlinear triangular planar element including rotational degrees of freedom, based on the co-rotational(CR) formulation. The CR formulation is one of the efficient geometrically nonlinear formulations and it is based on the assumptions on small strain and large rotation. In this paper, modified CR formulation is suggested for the developemnt of a triangular planar element. The present development is validated regarding the static and time transient problems. The present results are compared with the results predicted by the previous researchers and those obtained by the existing commercial software.
Mechanical Properties of High Stiffness Shear Connector
Eom, Chul-Hwan ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 491~496
DOI : 10.7734/COSEIK.2015.28.5.491
The headed studs used extensively for steel-composite construction are specified as SS400 in the current Korean Standard specification considering the welding condition. And the corresponding equation for the shear force calculation is limited for the use of compression strength of concrete below
. However, it is expected that the high strengthening and precasting of both steel and concrete due to the necessity of shear connector or other connecting material for the combination of steel and concrete. Therefore, the experimental results obtained during the development process of high strength stud for the connection of high strength concrete and the steel member are reported in this paper. Also the effectiveness of newly developed shear connector using pipe(pipe stud) to increase the stiffness of a stud is verified by comparing both the stiffness and the strength with common stud bolt through the welding ability, mechanical characteristics and experimental investigation.
Reduction of Free Edge Peeling Stress in Composite Laminates under Bending Load
Jung, Seok-Joo ; Sung, Myung-Kyun ; Kim, Heung Soo ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 497~502
DOI : 10.7734/COSEIK.2015.28.5.497
In this paper, a stress function-based approach was proposed to analyze the reduction of free-edge peeling stress in smart composite laminates using piezoelectric actuator under bending load. Electro-mechanically coupled governing equation was obtained by complimentary virtual work principle. The stress state was solved by the generalized eigenvalue procedure. The free-edge peeling stress of smart composite laminates was reduced by the piezoelectric actuation. The reduction rate of peeling stress in cross-ply composite laminate is larger than that in angle ply composite laminate.
An Evaluation of Blast Resistance of Partially Reinforced CFT Columns using Computational Analysis
Kim, Han-Soo ; Wee, Hae-Hwan ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 503~510
DOI : 10.7734/COSEIK.2015.28.5.503
In this paper, the blast resisting performance of partially reinforced CFT columns was compared with the normal CFT columns to evaluate the effect of reinforcing with steel plates. Autodyn which is a specialized hydro-code for analysis of explosion and impact was used to simulate the structural behavior of the CFT columns under the blast loadings. The interaction between concrete and surrounding steel plates was modeled with friction and join option to represent the realistic damage of columns. According to the analysis, the partially reinforced CFT column showed enhanced blast resisting performance than the normal CFT columns. Also the improvement of blast resisting performance was depended on the height of reinforcing steel plates.
Cyclic Structural Characteristics of Thermal Bridge Breaker Systems embedded in Reinforced Concrete Slabs
Shin, Dong-Hyeon ; Oh, Moung-Ho ; Kim, Young-Ho ; Kim, Hyung-Joon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 511~521
DOI : 10.7734/COSEIK.2015.28.5.511
The thermal bridge occurring in a building influences its thermal performance and durability. The domestic typical multi-unit residential buildings suffer thermal losses resulting from thermal bridges of the balcony slab. To minimize the thermal loss between inside and outside of the balcony slab, thermal bridge breaker(TBB) systems have been developed and applied in building construction. Although thermal bridge breaker systems for reinforced concrete(RC) wall-slab joints can improve the thermal performance of a building, it is necessary to verify the structural performance of TBB systems whether they provide proper resistance for cyclic loading. In order to investigate the structural characteristics of TBB systems embedded in RC slabs, cyclic tests of wall-slab joints were performed by applying two reversed cycles at each up to 30 cycles. The test results show that the RC slabs embedding TBBS systems can present excellent structural performance and the maximum moment capacity, energy dissipation capacity and ductility of TBBs systems are enhanced compared to those of the typical RC slabs.
The Structural Integrity Test for a PSC Containment with Unbonded Tendons and Numerical Analysis I
Noh, Sanghoon ; Jung, Raeyoung ; Kim, Sung-Taek ; Lim, Sang-Jun ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 523~533
DOI : 10.7734/COSEIK.2015.28.5.523
A reactor containment acts as a final barrier to prevent leakage of radioactive material due to the possible reactor accidents into external environment. Because of the functional importance of the containment building, the SIT(Structural Integrity Test) for containments shall be performed to evaluate the structural acceptability and demonstrate the quality of construction. An initial numerical analysis was performed to simulate the results obtained from the SIT for a prestressed concrete(PSC) structure. But the analysis results by the initial model expected smaller displacements than the measured ones by 30% at some locations. Accordingly, the research and development to improve the initial model to corelate the measured results of the SIT more properly have been performed. In this paper, the effects of the loss of concrete due to duct for tendons and the contact of duct and tendons in un-bonded tendon system are mainly evaluated based on the preliminary analysis results. In addition, the importances of the proper definition of mesh connectivity among structural elements of concrete, liner plates, rebars and tendons are discussed.
The Structural Integrity Test for a PSC Containment with Unbonded Tendons and Numerical Analysis II
Noh, Sanghoon ; Jung, Raeyoung ; Lee, Byungsoo ; Lim, Sang-Jun ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 535~542
DOI : 10.7734/COSEIK.2015.28.5.535
A reactor containment acts as a final barrier to prevent leakage of radioactive material due to the possible reactor accidents into external environment. Because of the functional importance of the containment building, the SIT(Structural Integrity Test) for containments shall be performed to evaluate the structural acceptability and demonstrate the quality of construction. In this paper, numerical analyses are presented, which simulate the results obtained from the SIT for a prestressed concrete(PSC) structure. A sophisticate structural analysis model is developed to simulate the structural behavior during the SIT properly based on various preliminary analysis results considering contact condition among structural elements. From the comparison of the analysis and test results based on the acceptance criteria of ASME CC-6000, it can be concluded that the construction quality of the containment has been well maintained and the acceptable performance of new design features has been verified.
Modified Gurson Model to Describe Non-linear Compressive Behaviour of Polyurethane Foam with Considering Density Effect
Lee, Jeong-Ho ; Park, Seong-Bo ; Kim, Seul-Kee ; Bang, Chang-Seon ; Lee, Jae-Myung ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 543~551
DOI : 10.7734/COSEIK.2015.28.5.543
Polyurethane Foam(PUF), a outstanding thermal insulation material, is used for various structures as being composed with other materials. These days, PUF composed with glass fiber, Reinforced PUF(R-PUF), is used for a insulation system of LNG Carrier and performs function of not only the thermal insulation but also a structural member for compressive loads like a sloshing load. As PUF is a porous material made by mixing and foaming, mechanical properties depend on volume fraction of voids which is a dominant parameter on density. Thus, In this study, density is considered as the effect parameter on mechanical properties of Polyurethane Foam, and mechanical behavior for compression of the material is described by using modified Gurson damage model.
3-D Free Vibration Analysis of Exponential and Power-law Functionally Graded Material(FGM) Plates
Lee, Won-Hong ; Han, Sung-Cheon ; Ahn, Jin-Hee ; Park, Weon-Tae ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 553~561
DOI : 10.7734/COSEIK.2015.28.5.553
The exponential and power law functionally graded material(FGM) theory is reformulated considering the refined shear and normal deformation theory. This theory has ability to capture the both normal deformation effect and exponential and power law function in terms of the volume fraction of the constituents for material properties through the plate thickness. Navier's method has been used to solve the governing equations for all edges simply supported plates on Pasternak elastic foundation. Numerical solutions of vibration analysis of FGM plates are presented using this theory to illustrate the effects of power law index and 3-D theory of exponential and power law function on natural frequency. The relations between 3-D and 2-D higher-order shear deformation theory are discussed by numerical results. Further, effects of (i) power law index, (ii) side-to-thickness ratio, and (iii) elastic foundation parameter on nondimensional natural frequency are studied. To validate the present solutions, the reference solutions are discussed.
Structural Performance Investigation for the Reinforced Concrete Frames Deteriorated by the Reinforcement Corrosion
Choi, Se-Woon ;
Journal of the Computational Structural Engineering Institute of Korea, volume 28, issue 5, 2015, Pages 563~570
DOI : 10.7734/COSEIK.2015.28.5.563
The existing research on the damage detection method for building structures has considered the damages from the excessive loadings such as the earthquake. However, the structural performance of building structures could be reduced due to the deterioration based on the chloride, carbonation during the long-term time. Thus, to effectively manage the healthiness of structures, the deterioration influences on the structures should be checked. In this study, the corrosion of rebars by the chloride is considered as the deterioration factor. To consider the structural performance reduction of the corroded rebars, the yield strength, cross-sectional area, rupture strain of rebars and the compressive strength of cover concrete based on the corrosion level are estimated. These properties of rebars and cover concrete are used for the procedure to evaluate the structural performance reduction of structural member level and the building level. The moment-curvature analysis is performed to evaluate the structural performance reduction of structural member level. Also, the eigenvalue analysis and the pushover analysis are performed to investigate the natural period and mode shape and the strength and deformation performance of buildings, respectively.